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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]Part of the respiratory tract, consisting of (1) the anterior nose nasal passage, and (the ET1 region2) and the posterior nasal passagespassage, pharynx and larynx (, designated as the ET2 ET₁ region and ET₂ region). The oral part , respectively, of the pharynx was part of ET2 but it is excluded from ET2 and included [[Human respiratory tract model]] as defined in the HATM (Human Alimentary Tract Model)[[ICRP Publication 130]].

''== Previous glossary entries == === from [[ICRP GlossaryPublication 130]] entry - June 2019'', 2015 === Part of the respiratory tract consisting of the anterior nasal passage (the ET₁ region) and the posterior nasal passage pharynx and larynx (the ET₂ region) as regions of the [[Human respiratory tract model]].